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When CP asymmetries in $B^0(t)\to \pi^+ \pi^-$ are combined using brokenflavor SU(3) with decay rates for $B^+\to K^0\pi^+$ and/or $B^0\to K^+\pi^-$,one can obtain stringent limits on the weak phase $\gamma$ which are consistentwith those obtained from other CKM constraints. Experimental data in the pastfew years have improved to the extent that systematic errors associated withuncertainty in SU(3) symmetry breaking dominate the determination of $\gamma$.We obtain a value $\gamma =(73 \pm 4^{+10}_{-8})^\circ$, where the first erroris statistical while the second one is systematic.

Systematic Error on Weak Phase $\gamma$ from $B \to \pi^+ \pi^-$ and $B \to K \pi$